558 



MOLLUSCA 



PHYLUM VI 



ivholly or partially covered hy margins of the inner and outer Ups. Operculum horny. 

 Cretaceous to Eeceiit. 



Murex Linn. (Figs. 1020-1022). Shell roimded, spire prominent. Surface with at 

 least three, often more than tliree varices or transverse rows of spines or nodes on each 



whorl. Apertiire ovate ; inner lip smooth, outer lip 

 thickened. Canal much prolonged, partially closed, 

 usually spinöse. Cretaceons to Kecent. 



Fig. 1020. 



Murex (Phyllonotus) sedgwicki Micht. 

 Miocene ; Gainfahrn, near Vienna. 



Fig. 1021 

 Murex spinicosta Bronn, 



Fig. 1022. 



Murex (Purpura) 

 tricarinatus Lam. Eo- 



FiG. 1023. 



Typhis tubifer 

 Montf. Calcaire 



Miocene ; 

 Vienna. 



Baden near cene ; Damery, near Grossier; Grignon, 



Epernay. 



near Paris. 



Subgenera : Haustellum Klein ; Rhinacantha Adams ; Chicoreus, Phyllonotus (Fig. 1020) 

 Montfort ; Purpura Martyn {Pteronotus Swainson) (Fig. 1022) ; Tritonalia Fleming {Oeinehra 

 Leacli), etc. 



Typhis Montf. (Fig. 1023). Like Murex, but with hollow spines. Canal short, 



completely closed. Upper Cretaceous to Ee- 

 cent. 



Trophon Montf. Spire high. Longitu- 

 dinal ribs replaced by thin lamellae. Canal 

 open, somewhat curved. Tertiary and Eecent. 



Family 4. Thaisidae Dali. 



Shell thick, usually ovoid ; spire short, 

 hody whorl large. Aperture ivide, inner lip 

 and columella more or less flattened ; canal 

 short. Operculum horny. Cretaceous to Ee- 

 cent. 



Fir 1024 ^^ ' 



Fig. 1025. Thais Bolten (Purpura Brug.) (Fig. 1024). 



Raijana laxecarinata Micht. Imperforate ; body whorl with transverse 

 OUgocene; Santa Giustina, ^ibs or nodes. Aperture oval, columella flat- 

 tened, smooth. Tertiary and Eecent. 

 Bapana Schum. (Fig. 1025). Like the preceding, but perforate. Inner lip callous, 

 expanded. Cretaceous to Eecent. 



Lysis Gabb ; Stenomphalus Sandberger. Cretaceous and Tertiary. 

 Bistrum Montf. {Ricinula Lam.) ; Äcanthina Fischer de Waldheim {Monoceros 

 Lam.) ; Goncholepas Lam. ; Gymia Mörch, etc. Tertiary and Eecent. 



Thais exilis 

 Partsch. Mio- 

 cene ; Möllers- 

 dorf, near Vienna. 



